Suppose astronauts are in a spaceship traveling toward Earth at 95% of the speed of light. Compared with when the ship was at rest on Mars, what length do the astronauts measure for their spaceship?
A) It cannot be determined; their life processes have slowed down too much for them to measure the length.
B) same
C) shorter
D) longer

Question

Quizplus · Accepted Answer

According to the theory of relativity, the length of an object as measured by an observer moving with the object is the same as its rest length. The astronauts are in the same inertial frame as their spaceship, so they would measure the spaceship to be the same length as when it was at rest.

Suppose Astronauts Are in a Spaceship Traveling Toward Earth at 95